ISS028-E-015888 (10 July 2011) --- In the Quest airlock of the International Space Station, NASA astronaut Rex Walheim, STS-135 mission specialist, checks out the extravehicular mobility unit space suits designated for duty on a spacewalk less than 48 hours away. Expedition 28 crewmembers Mike Fossum (right suit) and Ron Garan will be inside the suits for the spacewalk, scheduled for the morning of July 12.